EP0612649A1 - Telescopic steering colomn in particular for automotive vehicle - Google Patents

Telescopic steering colomn in particular for automotive vehicle Download PDF

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Publication number
EP0612649A1
EP0612649A1 EP94400391A EP94400391A EP0612649A1 EP 0612649 A1 EP0612649 A1 EP 0612649A1 EP 94400391 A EP94400391 A EP 94400391A EP 94400391 A EP94400391 A EP 94400391A EP 0612649 A1 EP0612649 A1 EP 0612649A1
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EP
European Patent Office
Prior art keywords
shaft
portions
shaft portions
telescopic steering
energy absorption
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP94400391A
Other languages
German (de)
French (fr)
Inventor
Michel Pourchot
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ECIA Equipements et Composants pour lIndustrie Automobile SA
Original Assignee
ECIA Equipements et Composants pour lIndustrie Automobile SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ECIA Equipements et Composants pour lIndustrie Automobile SA filed Critical ECIA Equipements et Composants pour lIndustrie Automobile SA
Publication of EP0612649A1 publication Critical patent/EP0612649A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
    • B62D1/185—Steering columns yieldable or adjustable, e.g. tiltable adjustable by axial displacement, e.g. telescopically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
    • B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
    • B62D1/16—Steering columns
    • B62D1/18—Steering columns yieldable or adjustable, e.g. tiltable
    • B62D1/19—Steering columns yieldable or adjustable, e.g. tiltable incorporating energy-absorbing arrangements, e.g. by being yieldable or collapsible
    • B62D1/192—Yieldable or collapsible columns
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/02—Shafts; Axles
    • F16C3/03—Shafts; Axles telescopic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/20—Land vehicles
    • F16C2326/24—Steering systems, e.g. steering rods or columns

Definitions

  • the present invention relates to a telescopic steering shaft, in particular for a motor vehicle.
  • These telescopic steering shafts are for example used in steering column assemblies with shock energy absorption and shock energy absorption means by controlling the axial displacement of the shaft portions relative to one another. the other, are interposed between the two shaft portions.
  • these means can be constituted by frangible members under a determined force, interposed between these two shaft portions.
  • energy absorption means are also known which are in the form of plastic rings or sleeves, connected to the internal shaft portion and mounted under stress in the external shaft portion to brake moving the shaft portions relative to each other and absorbing some energy.
  • the object of the invention is therefore to solve these problems by proposing a telescopic steering shaft which is simple and reliable and in which the means for absorbing impact energy can be calibrated with precision.
  • the subject of the invention is a telescopic steering shaft, in particular for a motor vehicle, of the type comprising two portions of tubular and cylindrical shafts which can be moved one inside the other, one of which has grooves.
  • axial external adapted to cooperate with complementary internal splines of the other shaft portion and shock energy absorption means by controlling the axial displacement of the shaft portions relative to each other, characterized in that the energy absorption means are formed by at least one zone of deformed section of at least one of the shaft portions, causing a localized ovalization thereof, allowing assembly under stress of the 'one of the tree portions in the other.
  • the telescopic steering shaft according to the invention is designated by the general reference 1.
  • This steering shaft is for example usable in a motor vehicle as an upper or lower shaft of a steering column assembly.
  • an upper shaft is the shaft carrying the steering wheel
  • a lower shaft is the shaft connecting the upper shaft to the rest of the steering mechanism of the motor vehicle.
  • This telescopic steering shaft comprises two portions of tubular and cylindrical shaft designated by the references 2 and 3 in this figure.
  • shaft portions are mounted so that they can slide one inside the other and the internal shaft portion 3 comprises external axial splines designated by the reference 4, adapted to cooperate with complementary internal splines 5 of the other portion. shaft to ensure a rotational connection of these two shaft portions, while allowing sliding movement thereof in one another.
  • This steering shaft also comprises means for absorbing impact energy by controlling the axial displacement of the shaft portions one inside the other and these energy absorption means are formed by at least one zone of deformed section of at least one of the shaft portions, causing a localized ovalization thereof, allowing mounting under stress of one of the shaft portions in the other to slow the axial movement of the portions d tree relative to each other.
  • shock energy absorption means are formed on the outer shaft portion 2 which comprises two zones of deformed section designated by the references 6 and 7 in this figure.
  • zones of deformed section 6 and 7 are diametrically opposite, but of course another number deformed section zones can be used, for example three, offset by 120 ° with respect to each other.
  • zones of deformed section can be formed on the internal shaft portion 3 or on the two shaft portions.
  • deformed cross-sectional areas can be obtained for example by a cold stamping tool in a conventional manner.
  • the telescopic steering shaft according to the invention has a certain number of advantages compared to the shafts known in the state of the art insofar as it does not require the use of additional parts such as the frangible members. and the plastic sleeves used in the prior art.
  • the quality control of such a tree is extremely easy to carry out insofar as the effort necessary to slide one of the parts into the other, that is to say the degree of absorption of energy of the shaft, can be determined during the fitting of the inner shaft portion into the outer shaft portion insofar as the resistance to the penetration of these shaft portions one into the another is determined by the degree of straining of these shaft portions into one another.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Engineering & Computer Science (AREA)
  • Ocean & Marine Engineering (AREA)
  • Steering Controls (AREA)
  • Vibration Dampers (AREA)

Abstract

This telescopic steering shaft, particularly for a motor vehicle, of the type including two tubular and cylindrical shaft portions (2, 3) which can be moved in terms of sliding one inside the other, one of which (3) includes external axial splines (4) designed to interact with complementary internal splines (5) on the other shaft portion and means for absorbing impact energy by controlling the axial displacement of the shaft portions with respect to one another, is characterised in that the energy-absorption means are formed from at least one zone (6, 7) of deformed cross-section on at least one of the shaft portions (2, 3), giving rise to localised ovalisation of the latter, allowing one of the shaft portions to be fitted under prestress in the other. <IMAGE>

Description

La présente invention concerne ur arbre de direction télescopique notamment pour véhicule automobile.The present invention relates to a telescopic steering shaft, in particular for a motor vehicle.

On connaît déjà dans l'état de la technique, un certain nombre d'arbres de direction télescopiques qui comportent deux portions d'arbre tubulaires et cylindriques et déplaçables à coulissement l'une dans l'autre, dont l'une comporte des cannelures axiales externes adaptées pour coopérer avec des cannelures internes complémentaires de l'autre portion d'arbre.Already known in the prior art, a number of telescopic steering shafts which have two portions of tubular and cylindrical shafts and which can be displaced in sliding one inside the other, one of which has axial grooves external adapted to cooperate with internal grooves complementary to the other portion of the shaft.

Ces arbres de direction télescopiques sont par exemple utilisés dans des ensembles de colonne de direction à absorption d'énergie de choc et des moyens d'absorption d'énergie de choc par contrôle du déplacement axial des portions d'arbre l'une par rapport à l'autre, sont interposés entre les deux portions d'arbre.These telescopic steering shafts are for example used in steering column assemblies with shock energy absorption and shock energy absorption means by controlling the axial displacement of the shaft portions relative to one another. the other, are interposed between the two shaft portions.

Différents modes de réalisation de ces moyens d'absorption d'énergie de choc sont connus dans l'état de la technique.Different embodiments of these shock energy absorption means are known in the state of the art.

C'est ainsi par exemple que ces moyens peuvent être constitués par des organes frangibles sous un effort déterminé, interposés entre ces deux portions d'arbre.Thus, for example, these means can be constituted by frangible members under a determined force, interposed between these two shaft portions.

Par ailleurs, on connaît également des moyens d'absorption d'énergie qui se présentent sous la forme de bagues ou de manchons en matière plastique, reliés à la portion d'arbre interne et montés sous contrainte dans la portion d'arbre externe pour freiner le déplacement des portions d'arbre l'une par rapport à l'autre et absorber une certaine énergie.Furthermore, energy absorption means are also known which are in the form of plastic rings or sleeves, connected to the internal shaft portion and mounted under stress in the external shaft portion to brake moving the shaft portions relative to each other and absorbing some energy.

Ces différentes solutions présentent un certain nombre d'inconvénients au niveau de l'automatisation de la fabrication des arbres correspondants et de la qualité des pièces obtenues.These different solutions have a certain number of drawbacks in terms of the automation of the production of the corresponding shafts and the quality of the parts obtained.

En effet, la solution la plus répandue actuellement est celle utilisant des manchons en matière plastique, mais la fabrication de ceux-ci se traduit par des déchets importants dans la mesure où il est extrêmement difficile de contrôler avec précision le degré de mise sous contrainte de ces manchons dans la portion d'arbre externe et donc la capacité d'absorption d'énergie de l'arbre.Indeed, the most widespread solution currently is that using plastic sleeves, but the manufacture of these results in significant waste since it is extremely difficult to precisely control the degree of stressing of these sleeves in the outer shaft portion and therefore the energy absorption capacity of the shaft.

Le but de l'invention est donc de résoudre ces problèmes en proposant un arbre de direction télescopique qui soit simple et fiable et dans lequel les moyens d'absorption d'énergie de choc puissent être calibrés avec précision.The object of the invention is therefore to solve these problems by proposing a telescopic steering shaft which is simple and reliable and in which the means for absorbing impact energy can be calibrated with precision.

A cet effet, l'invention a pour objet un arbre de direction télescopique notamment pour véhicule automobile, du type comportant deux portions d'arbre tubulaires et cylindriques et déplaçables à coulissement l'une dans l'autre, dont l'une comporte des cannelures axiales externes adaptées pour coopérer avec des cannelures internes complémentaires de l'autre portion d'arbre et des moyens d'absorption d'énergie de choc par contrôle du déplacement axial des portions d'arbre l'une par rapport à l'autre, caractérisé en ce que les moyens d'absorption d'énergie sont formés par au moins une zone de section déformée d'au moins l'une des portions d'arbre, provoquant une ovalisation localisée de celle-ci, permettant un montage sous contrainte de l'une des portions d'arbre dans l'autre.To this end, the subject of the invention is a telescopic steering shaft, in particular for a motor vehicle, of the type comprising two portions of tubular and cylindrical shafts which can be moved one inside the other, one of which has grooves. axial external adapted to cooperate with complementary internal splines of the other shaft portion and shock energy absorption means by controlling the axial displacement of the shaft portions relative to each other, characterized in that the energy absorption means are formed by at least one zone of deformed section of at least one of the shaft portions, causing a localized ovalization thereof, allowing assembly under stress of the 'one of the tree portions in the other.

L'invention sera mieux comprise à l'aide de la description qui va suivre, donnée uniquement à titre d'exemple et faite en se référant au dessin annexé qui représente un mode de réalisation d'un arbre de direction selon l'invention.The invention will be better understood with the aid of the description which follows, given solely by way of example and made with reference to the appended drawing which represents an embodiment of a steering shaft according to the invention.

Ainsi qu'on peut le voir sur cette figure, l'arbre de direction télescopique selon l'invention est désigné par la référence générale 1.As can be seen in this figure, the telescopic steering shaft according to the invention is designated by the general reference 1.

Cet arbre de direction est par exemple utilisable dans un véhicule automobile en tant qu'arbre supérieur ou inférieur d'un ensemble de colonne de direction.This steering shaft is for example usable in a motor vehicle as an upper or lower shaft of a steering column assembly.

On rappellera qu'un arbre supérieur est l'arbre portant le volant, tandis qu'un arbre inférieur est l'arbre reliant l'arbre supérieur au reste du mécanisme de direction du véhicule automobile.It will be recalled that an upper shaft is the shaft carrying the steering wheel, while a lower shaft is the shaft connecting the upper shaft to the rest of the steering mechanism of the motor vehicle.

Cet arbre de direction télescopique comporte deux portions d'arbre tubulaires et cylindriques désignées par les références 2 et 3 sur cette figure.This telescopic steering shaft comprises two portions of tubular and cylindrical shaft designated by the references 2 and 3 in this figure.

Ces portions d'arbre sont montées déplaçables à coulissement l'une dans l'autre et la portion d'arbre interne 3 comporte des cannelures axiales externes désignées par la référence 4, adaptées pour coopérer avec des cannelures internes complémentaires 5 de l'autre portion d'arbre pour assurer une liaison en rotation de ces deux portions d'arbre, tout en autorisant un déplacement à coulissement de celles-ci l'une dans l'autre.These shaft portions are mounted so that they can slide one inside the other and the internal shaft portion 3 comprises external axial splines designated by the reference 4, adapted to cooperate with complementary internal splines 5 of the other portion. shaft to ensure a rotational connection of these two shaft portions, while allowing sliding movement thereof in one another.

Cet arbre de direction comporte également des moyens d'absorption d'énergie de choc par contrôle du déplacement axial des portions d'arbre l'une dans l'autre et ces moyens d'absorption d'énergie sont formés par au moins une zone de section déformée d'au moins l'une des portions d'arbre, provoquant une ovalisation localisée de celle-ci, permettant un montage sous contrainte de l'une des portions d'arbre dans l'autre pour freiner le déplacement axial des portions d'arbre l'une par rapport à l'autre.This steering shaft also comprises means for absorbing impact energy by controlling the axial displacement of the shaft portions one inside the other and these energy absorption means are formed by at least one zone of deformed section of at least one of the shaft portions, causing a localized ovalization thereof, allowing mounting under stress of one of the shaft portions in the other to slow the axial movement of the portions d tree relative to each other.

Dans le mode de réalisation représenté sur cette figure, ces moyens d'absorption d'énergie de choc sont formés sur la portion d'arbre externe 2 qui comporte deux zones de section déformée désignées par les références 6 et 7 sur cette figure.In the embodiment shown in this figure, these shock energy absorption means are formed on the outer shaft portion 2 which comprises two zones of deformed section designated by the references 6 and 7 in this figure.

Ces zones de section déformée 6 et 7 sont diamétralement opposées, mais bien entendu un autre nombre de zones de section déformée peut être utilisé comme par exemple trois, décalées de 120° les unes par rapport aux autres.These zones of deformed section 6 and 7 are diametrically opposite, but of course another number deformed section zones can be used, for example three, offset by 120 ° with respect to each other.

Bien entendu également, ces zones de section déformée peuvent être ménagées sur la portion d'arbre interne 3 ou sur les deux portions d'arbre.Of course also, these zones of deformed section can be formed on the internal shaft portion 3 or on the two shaft portions.

Il va de soi également que plusieurs zones de section déformée peuvent être réparties le long d'une ou de chaque portion d'arbre pour améliorer encore l'absorption d'énergie.It also goes without saying that several zones of deformed section can be distributed along one or each portion of the shaft to further improve energy absorption.

Ces zones de section déformées peuvent être obtenues par exemple par un outil de frappe à froid de manière classique.These deformed cross-sectional areas can be obtained for example by a cold stamping tool in a conventional manner.

On conçoit que l'arbre de direction télescopique selon l'invention présente un certain nombre d'avantages par rapport aux arbres connus dans l'état de la technique dans la mesure où il ne nécessite pas l'utilisation de pièces supplémentaires comme les organes frangibles et les manchons en matière plastique utilisés dans l'état de la technique.It will be appreciated that the telescopic steering shaft according to the invention has a certain number of advantages compared to the shafts known in the state of the art insofar as it does not require the use of additional parts such as the frangible members. and the plastic sleeves used in the prior art.

Par ailleurs, le contrôle de qualité d'un tel arbre est extrêmement facile à réaliser dans la mesure où l'effort nécessaire pour faire coulisser l'une des pièces dans l'autre, c'est à dire le degré d'absorption d'énergie de l'arbre, peut être déterminé lors de l'emmanchement de la portion d'arbre interne dans la portion d'arbre externe dans la mesure où la résistance à l'enfoncement de ces portions d'arbre l'une dans l'autre est déterminée par le degré de mise sous contrainte de ces portions d'arbre l'une dans l'autre.Furthermore, the quality control of such a tree is extremely easy to carry out insofar as the effort necessary to slide one of the parts into the other, that is to say the degree of absorption of energy of the shaft, can be determined during the fitting of the inner shaft portion into the outer shaft portion insofar as the resistance to the penetration of these shaft portions one into the another is determined by the degree of straining of these shaft portions into one another.

Claims (2)

Arbre de direction télescopique notamment pour véhicule automobile, du type comportant deux portions d'arbre (2,3) tubulaires et cylindriques et déplaçables à coulissement l'une dans l'autre, dont l'une (3) comporte des cannelures axiales externes (4) adaptées pour coopérer avec des cannelures internes complémentaires (5) de l'autre portion d'arbre et des moyens d'absorption d'énergie de choc par contrôle du déplacement axial des portions d'arbre l'une par rapport à l'autre, caractérisé en ce que les moyens d'absorption d'énergie sont formés par au moins une zone (6,7) de section déformée d'au moins l'une des portions d'arbre (2,3), provoquant une ovalisation localisée de celle-ci, permettant un montage sous contrainte de l'une des portions d'arbre dans l'autre.Telescopic steering shaft, in particular for a motor vehicle, of the type comprising two portions of tubular and cylindrical shaft (2,3) which can be moved one inside the other, one of which (3) has external axial splines ( 4) adapted to cooperate with complementary internal splines (5) of the other shaft portion and means for absorbing impact energy by controlling the axial displacement of the shaft portions relative to the other, characterized in that the energy absorption means are formed by at least one zone (6,7) of deformed section of at least one of the shaft portions (2,3), causing an ovalization localized thereof, allowing mounting under stress of one of the shaft portions in the other. Arbre de direction selon la revendication 1, caractérisé en ce que les moyens d'absorption d'énergie de choc comportent plusieurs zones de section déformée réparties sur la ou chaque portion d'arbre.Steering shaft according to claim 1, characterized in that the impact energy absorption means comprise several zones of deformed section distributed over the or each portion of the shaft.
EP94400391A 1993-02-24 1994-02-23 Telescopic steering colomn in particular for automotive vehicle Withdrawn EP0612649A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9302121A FR2701915B1 (en) 1993-02-24 1993-02-24 Telescopic steering shaft, especially for motor vehicles.
FR9302121 1993-02-24

Publications (1)

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EP0612649A1 true EP0612649A1 (en) 1994-08-31

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EP94400391A Withdrawn EP0612649A1 (en) 1993-02-24 1994-02-23 Telescopic steering colomn in particular for automotive vehicle

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FR (1) FR2701915B1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0810140A2 (en) * 1996-05-30 1997-12-03 Koyo Seiko Co., Ltd. A power transmission shaft in a steering unit and assembly method thereof
US5813794A (en) * 1996-04-18 1998-09-29 Castellon; Melchor Daumal Telescopic shafts
EP0916565A1 (en) * 1997-11-15 1999-05-19 Volkswagen Aktiengesellschaft Pipe-shaped or rod-shaped article and method for its manufacture
US6105413A (en) * 1994-12-29 2000-08-22 Dana Corporation Method of forming a one piece steering shaft member
GB2347389A (en) * 1999-03-04 2000-09-06 Nsk Ltd Shock absorbing steering shaft and method of manufacture
EP2787235A4 (en) * 2011-11-30 2015-08-19 Nsk Ltd Telescopic shaft

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150333A1 (en) * 1984-01-13 1985-08-07 Lemfoerder Metallwaren Ag. Safety steering shaft comprising inner shaft and outer tube
EP0220986A2 (en) * 1985-10-30 1987-05-06 Ecia - Equipements Et Composants Pour L'industrie Automobile Telescopic transmission shaft with angular-play adjustment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0150333A1 (en) * 1984-01-13 1985-08-07 Lemfoerder Metallwaren Ag. Safety steering shaft comprising inner shaft and outer tube
EP0220986A2 (en) * 1985-10-30 1987-05-06 Ecia - Equipements Et Composants Pour L'industrie Automobile Telescopic transmission shaft with angular-play adjustment

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6257041B1 (en) 1994-12-29 2001-07-10 Spicer Driveshaft, Inc. Method of forming a one-piece steering shaft member
US6105413A (en) * 1994-12-29 2000-08-22 Dana Corporation Method of forming a one piece steering shaft member
US5813794A (en) * 1996-04-18 1998-09-29 Castellon; Melchor Daumal Telescopic shafts
EP0810140A3 (en) * 1996-05-30 1998-10-21 Koyo Seiko Co., Ltd. A power transmission shaft in a steering unit and assembly method thereof
US5954362A (en) * 1996-05-30 1999-09-21 Koyo Seiko Co., Ltd. Power transmission shaft in a steering unit and assembly method thereof
EP0810140A2 (en) * 1996-05-30 1997-12-03 Koyo Seiko Co., Ltd. A power transmission shaft in a steering unit and assembly method thereof
EP0916565A1 (en) * 1997-11-15 1999-05-19 Volkswagen Aktiengesellschaft Pipe-shaped or rod-shaped article and method for its manufacture
GB2347389A (en) * 1999-03-04 2000-09-06 Nsk Ltd Shock absorbing steering shaft and method of manufacture
GB2347389B (en) * 1999-03-04 2001-10-03 Nsk Ltd Method for manufacturing a shock absorbing type steering shaft
US6574850B1 (en) 1999-03-04 2003-06-10 Nsk Ltd. Method for manufacturing shock absorbing type steering shaft
US6619694B2 (en) 1999-03-04 2003-09-16 Nsk Ltd. Shock absorbing type steering shaft
US6701602B2 (en) 1999-03-04 2004-03-09 Nsk Ltd. Method for manufacturing shock absorbing type steering shaft
EP2787235A4 (en) * 2011-11-30 2015-08-19 Nsk Ltd Telescopic shaft
US9951806B2 (en) 2011-11-30 2018-04-24 Nsk Ltd. Telescopic shaft

Also Published As

Publication number Publication date
FR2701915B1 (en) 1995-05-24
FR2701915A1 (en) 1994-09-02

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Withdrawal date: 19951109